TCM & TCC in valve body
does this help you > http://www.sonnax.com/articles/137-AW-6- Speeds-Valve-Body-Diagnosis...................and > http://www.sonnax.com/articles/209-AW-55-50-AF23-33-Diagnosis- and-Valve-Body-Information
the sierra came with several transmissions, the 4 speed and two versions of the 6 speed all six speeds have the tcm in the pan and contain all solenoids, the four speed is the 4l60-e and has an external tcm (transmission control module) and the torque converter clutch (tcc) is in the panand is intergal to the solenoid harness
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